The invention discloses a plant growing device for the gravel contact oxidation process, comprising a growing module, a gravel bed module and an aeration module; the growing module is of a hollow pipestructure provided with multiple groups of through holes, each group of through holes are formed in the same vertical plane, and the growing module is filled with soil for planting; the gravel bed module comprises a gravel bed body, a water inlet pipe and a water outlet pipe; the growing module is arranged on the gravel bed body, the gravel bed body comprises a first gravel layer and a second gravel layer up to down sequentially, and the grain size of stuffing of the first gravel layer is greater than that of the stuffing of the second gravel layer; the water inlet pipe is connected to the second gravel layer while the water outlet pipe is connected to the first gravel layer; and the aeration module is arranged between the first gravel layer and the second gravel layer. The plant growingdevice, based on effective integration of techniques such as plant absorption, gravel contact oxidation and construction of artificial wetland, can increase survival rate of plants in the gravel contact oxidation processing structure.